Reamer adapter



July 25, 1950 F. E. LUSTENBERGER ETAL 2,516,709

REAMER ADAPTER Filed July 15, 1949 Wwwu ATTORNEY Patented July 25, 1950 REAMER ADAPTER Frederick E. Lustenberger, New York, and Gerald Cardinal, Brooklyn, N. Y.

Application July 13, 1949, Serial No. 104,568

This invention relates provements in reamer adapters, and has more particular reference to a new adapter which will facilitate reaming straight holes.

Heretofore, it has been customary to use a bushing for mounting a reamer in a machine tool. The use of bushings has many drawbacks, most important of which is'that a different size bushing is required for each different size reamer.

This invention particularly proposes the construction of a reamer adapter which is capable of receiving various sizes of reamers up to a maximum size, limited merely by the opening in the adapter.

A further object of this invention resides in providing the reamer adapter with a center which is coaxial either with the outside diameter of the adapter when the adapter is used in a floating holder of a turret lathe, or which is concentric with a spindle when the adapter is used upon an engine lathe. The invention also proposes providing the adapter with a plurality of set screws about its periphery spaced from said center and engageable against the sides of the reamer for properly centering the reamer to the hole which is to be reamed, and also for keeping the reamer from spinning in the adapter.

Another object of the invention is the construction of a reamer adapter as described, which is simple and durable and which may be manufactured and sold at a reasonable cost.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of the disclosure:

Fig. 1 is an end view of a reamer adapter constructed in accordance with this invention.

Fig. 2 is a side view of Fig. 1 with a portion shown in section as though taken on the line 22 of Fig. 1.

Fig. 3 is a fragmentary sectional view similar to Fig. 2 but disclosing another form of the new reamer adapter.

The reamer adapter disclosed in Figs. 1 and 2, includes a hollow cylindrical body l having a back end wall ll closing the back end thereof. The inside diameter of the hollow cylindrical body In is large enough to selectively receive a number of different size reamers. A plurality of set screws l2 are threadedly mounted radially about the front end portion of said body H1. The set to new and useful im- 1 Claim. (Cl. 279'83) screws 12 may be used for centering the reamer in the cylindrical body If) and for tightly holding it against spinning.

Means is associated with the body [0 by which it may be coaxially mounted of the spindle of a machine tool. This means comprises merely an outside. diameter [4 for engaging in the usual floating holder of a turret lathe. A center [5 for engaging the inner end of a reamer is located on the inner face of the back end wall H at a substantial distance from said set screws l2. This center I5 is illustrated as being of the male type, though it could be female, or an adapter plug may be engaged in the reamer adapter as will be more specifically described in the next form of this invention.

In Fig. 3 another form of the invention has been disclosed in which the reamer adapter is particularly designed for an engine lathe. It distinguishes from the prior form in the provision of a spindle I6 on the back end wall II coaxially of the center 15. In other respects this form of the invention is identical to the prior form and like parts have been identified by like reference numerals.

An adapter plug I1 is illustrated engaged in the hollow cylindrical body [0. This adapter plug [1 is provided with female centers [8, one of which is engaged over the center l5 and the other of which is capable of receiving the male center of a reamer.

The operation of the reamer adapter may be understood from the following:

After a hole has been drilled and bored in work the reamer is set into the adapter, inserting the female center of the latter on the main center of the adapter. The adapter is mounted in the machine tool. If the machine tool is a turret lathe the adapter is mounted in the usual floating holder thereof. If an engine lathe, the spindle I6 is utilized for mounting the adapter in position. In the event that the reamer has a male center, the plug H is inserted into the adapter so that its female center l8 may receive the male center of the reamer.

The reamer is then set against the hole to be reamed and the set screws l2 are tightened down on the shank of the reamer to center the reamer to the hole and also to keep the reamer from spinning in the adapter. With this procedure it is almost impossible not to get the reamer on true center because of the fact that the outside diameter M of the adapter, or the spindle l6 of the second adapter, is concentric with the centers l5, or l8. This construction eliminates guess work on the part of the set-up man or operator of the machine in determining what is causing the trouble he may be having in obtaining a. straight hole when using the old bushings. The new adapter therefore decreases the time required for setting up a job. Another advantage of the new adapter is that it may take a reamer up to the size of the inside diameter of the body Hi. :With the new adapter straight holes may easily be reamed with tolerances as close as plus nothing minus two ten thousandths (+.0000.0002) or vice versa.

While we have illustrated and describedi'the preferred embodiments of our invention, it. is to be understood that we do not limit ourselves to the precise constructions herein disclosed and the right is reserved to all changes-andmodifications coming within the scope of the invention as defined in the appended claims.

Having thus described our invention, what we claim as new anddesire to secure by United states Letters'Patent-is:

A reamer adapter, conr-iprising a*hollowoylin- -drical body having a--back end-wall closing the backendfithereof and an inside diameter large enoug li to selectively receive a number *ofdiffer- #en'tsi-ze reamers, a plurality of setscrews threadedly mounted radially about the front endportion of said-bodyforcentering and tightly hold- 4 ing a reamer disposed axially in said body, means for centering said body coaxially of the spindle of a machine tool, and a center for the inner end of said reamer located on the inner face of said back end wall at a substantial distance from said set screws.

FREDERICK E. LUSTENBERGER. GERALD CARDINAL.

REFERENCES ()ITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1375298 Ferrin Apr. 1, 1873 366,908 .Wi-nscr July 19, 1887 FOREIGN PATENTS Number Country Date A 5023669 .sErance .;:May:2?g1920 OTHER REFERENCES James (American-uMachinist"), -publ-ished .by

; Waychofi (American Mac-hinist published by copyin Dim-52). 

